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SubjectRe: [PATCH V2 1/3] thermal/int340x_thermal: Export GDDV
Date
On Mon, 2020-04-13 at 19:09 -0700, Matthew Garrett wrote:
> From: Matthew Garrett <mjg59@google.com>
>
> Implementing DPTF properly requires making use of firmware-provided
> information associated with the INT3400 device. Calling GDDV provides
> a
> buffer of information which userland can then interpret to determine
> appropriate DPTF policy.
>
> Signed-off-by: Matthew Garrett <mjg59@google.com>
Tested-by: Pandruvada, Srinivas <srinivas.pandruvada@linux.intel.com>

> ---
> .../intel/int340x_thermal/int3400_thermal.c | 60
> +++++++++++++++++++
> 1 file changed, 60 insertions(+)
>
> diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> index ceef89c956bd4..00a7732724cd0 100644
> --- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> +++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> @@ -52,6 +52,25 @@ struct int3400_thermal_priv {
> u8 uuid_bitmap;
> int rel_misc_dev_res;
> int current_uuid_index;
> + char *data_vault;
> +};
> +
> +static ssize_t data_vault_read(struct file *file, struct kobject
> *kobj,
> + struct bin_attribute *attr, char *buf, loff_t off, size_t
> count)
> +{
> + memcpy(buf, attr->private + off, count);
> + return count;
> +}
> +
> +static BIN_ATTR_RO(data_vault, 0);
> +
> +static struct bin_attribute *data_attributes[] = {
> + &bin_attr_data_vault,
> + NULL,
> +};
> +
> +static const struct attribute_group data_attribute_group = {
> + .bin_attrs = data_attributes,
> };
>
> static ssize_t available_uuids_show(struct device *dev,
> @@ -278,6 +297,32 @@ static struct thermal_zone_params
> int3400_thermal_params = {
> .no_hwmon = true,
> };
>
> +static void int3400_setup_gddv(struct int3400_thermal_priv *priv)
> +{
> + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
> + union acpi_object *obj;
> + acpi_status status;
> +
> + status = acpi_evaluate_object(priv->adev->handle, "GDDV", NULL,
> + &buffer);
> + if (ACPI_FAILURE(status) || !buffer.length)
> + return;
> +
> + obj = buffer.pointer;
> + if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count != 1
> + || obj->package.elements[0].type != ACPI_TYPE_BUFFER) {
> + kfree(buffer.pointer);
> + return;
> + }
> +
> + priv->data_vault = kmemdup(obj-
> >package.elements[0].buffer.pointer,
> + obj-
> >package.elements[0].buffer.length,
> + GFP_KERNEL);
> + bin_attr_data_vault.private = priv->data_vault;
> + bin_attr_data_vault.size = obj-
> >package.elements[0].buffer.length;
> + kfree(buffer.pointer);
> +}
> +
> static int int3400_thermal_probe(struct platform_device *pdev)
> {
> struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
> @@ -309,6 +354,8 @@ static int int3400_thermal_probe(struct
> platform_device *pdev)
>
> platform_set_drvdata(pdev, priv);
>
> + int3400_setup_gddv(priv);
> +
> int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
> int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
>
> @@ -327,6 +374,13 @@ static int int3400_thermal_probe(struct
> platform_device *pdev)
> if (result)
> goto free_rel_misc;
>
> + if (priv->data_vault) {
> + result = sysfs_create_group(&pdev->dev.kobj,
> + &data_attribute_group);
> + if (result)
> + goto free_uuid;
> + }
> +
> result = acpi_install_notify_handler(
> priv->adev->handle, ACPI_DEVICE_NOTIFY,
> int3400_notify,
> (void *)priv);
> @@ -336,6 +390,9 @@ static int int3400_thermal_probe(struct
> platform_device *pdev)
> return 0;
>
> free_sysfs:
> + if (priv->data_vault)
> + sysfs_remove_group(&pdev->dev.kobj,
> &data_attribute_group);
> +free_uuid:
> sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
> free_rel_misc:
> if (!priv->rel_misc_dev_res)
> @@ -360,8 +417,11 @@ static int int3400_thermal_remove(struct
> platform_device *pdev)
> if (!priv->rel_misc_dev_res)
> acpi_thermal_rel_misc_device_remove(priv->adev-
> >handle);
>
> + if (priv->data_vault)
> + sysfs_remove_group(&pdev->dev.kobj,
> &data_attribute_group);
> sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
> thermal_zone_device_unregister(priv->thermal);
> + kfree(priv->data_vault);
> kfree(priv->trts);
> kfree(priv->arts);
> kfree(priv);
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